.one {
  .navbar {
    background-image: url('https://img1.baidu.com/it/u=2021118064,3164324987&fm=26&fmt=auto') !important;
    background-size: contain;
  }
  .sidebar-container .scrollbar-wrapper {
    background-image: url('https://img1.baidu.com/it/u=2021118064,3164324987&fm=26&fmt=auto') !important;
    background-size: contain;
  }
}
.two {
  .navbar {
    background-image: url('https://img2.baidu.com/it/u=3983622294,3123611233&fm=26&fmt=auto') !important;
  }
  .sidebar-container .scrollbar-wrapper {
    background-image: url('https://img2.baidu.com/it/u=3983622294,3123611233&fm=26&fmt=auto') !important;
    background-size: contain;
  }
}
.three {
  .navbar {
    background-image: url('https://img1.baidu.com/it/u=1786003036,2551804633&fm=224&fmt=auto&gp=0.jpg') !important;
  }
  .sidebar-container .scrollbar-wrapper {
    background-image: url('https://img1.baidu.com/it/u=1786003036,2551804633&fm=224&fmt=auto&gp=0.jpg') !important;
    background-size: contain;
  }
}